Lub hom phiaj ntawm kev kho cua sov zaum kawg yog txhawm rau txhim kho cov khoom siv xws li hardness, hnav tsis kam, thiab lub zog.
(1) Quenching
Quenching tuaj yeem faib rau hauv qhov chaw quenching thiab tag nrho quenching. Deg quenching yog dav siv vim nws qhov tsawg kawg nkaus deformation, oxidation, thiab decarburization, thiab nws muaj qhov zoo xws li lub zog sab nraud, zoo hnav tsis kam, thaum tuav zoo sab hauv toughness thiab cuam tshuam tsis kam. Txhawm rau txhim kho cov khoom siv ntawm qhov chaw-quenched, kev npaj kho cua sov zoo li tempering lossis normalizing feem ntau ua. Cov txheej txheem dav dav yog raws li hauv qab no: blanking → forging → normalizing (los yog annealing) → roughing → tempering → semi-finishing → nto quenching → xov.
(2) Carburizing thiab quenching
Carburizing thiab quenching yog tsim rau cov pa roj carbon tsawg thiab cov hlau tsis tshua muaj hlau. Nws thawj zaug nce cov ntsiab lus carbon ntawm ib feem ntawm qhov chaw, tso cai rau siab hardness tom qab quenching, thaum cov tub ntxhais tseem khaws tau qee lub zog, siab toughness, thiab plasticity. Carburizing tuaj yeem yog tag nrho lossis ib nrab. Rau ib nrab carburizing, kev ntsuas los tiv thaiv carburizing (xws li tooj liab plating lossis txheej nrog cov khoom siv los tiv thaiv carburizing) yuav tsum tau coj mus rau qhov chaw uas tsis yog carburized. Vim yog qhov tseem ceeb deformation thaum lub sij hawm carburizing thiab quenching, thiab raug carburizing qhov tob xws li ntawm 0.5 mus rau 2mm, cov txheej txheem carburizing feem ntau yog teem caij nruab nrab ntawm kev ua tiav thiab tiav.
Cov txheej txheem raug yog: blanking → forging → normalizing → roughing thiab semi-finishing → carburizing thiab quenching → xov.
Thaum cov tsis-carburized ib feem ntawm ib feem ntawm carburized ib feem txais cov txheej txheem ntawm kev nce cov nyiaj pub dawb thiab tom qab ntawd tshem tawm cov txheej carburized ntau dhau, cov kauj ruam ntawm kev tshem tawm cov txheej txheem ntau dhau yuav tsum tau teem caij tom qab carburizing tab sis ua ntej quenching.
(3) Kev kho Nitriding
Nitriding yog txheej txheem kev kho mob qhov twg nitrogen atoms yog infused rau hauv cov hlau nto los tsim ib txheej ntawm nitrogen-muaj cov tebchaw. Cov txheej nitrided txhim kho qhov nyuaj ntawm qhov chaw, hnav tsis kam, qaug zog, thiab corrosion kuj. Txij li thaum nitriding tau ua nyob rau ntawm qhov kub qis, ua rau muaj qhov deformation tsawg, thiab cov txheej nitrided nyias nyias (feem ntau tsis tshaj 0.6-0.7mm), cov txheej txheem nitriding yuav tsum tau teem caij lig li sai tau. Txhawm rau txo qis deformation thaum lub sij hawm nitriding, qhov kub-kub-relieving tempering feem ntau yuav tsum tau tom qab txiav.
